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Block specific email address or domain in O365

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Connect to O365 either via Azure Powershell or Windows Powershell

Run the following commands in one go, just feed the Global Administrator details when prompted.

Import-Module MSOnline
$O365Cred = Get-Credential
$O365Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell -Credential $O365Cred -Authentication Basic -AllowRedirection
Import-PSSession $O365Session -AllowClobber
Connect-MsolService -Credential $O365Cred

Once connected, run the following command to block the Email Address or Email Domain

Get-Mailbox -ResultSize Unlimited | Set-MailboxJunkEmailConfiguration -BlockedSendersAndDomains "unitedwaypoco.org","redirectuniteplugs781@unitedwaypoco.org","noreply@officeservice.com","officeservice.com"

Check the addition in bulk : 

Get-Mailbox -ResultSize Unlimited | Set-MailboxJunkEmailConfiguration

Result will look like :


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